// -*- C -*-

cable_maxdia = 12;
cable_mindia = 6;

wallmin = 1;
wall = 2;

delta_ellipse = 0.5;

// calculated

outerdia = cable_maxdia / cos(30) + wall*2;
delta_shift = 1 - delta_ellipse;

module CrossSection(plus=0) {
  difference(){
    circle(r= outerdia/2 + plus, $fn=6);

    scale([cable_maxdia,
	   cable_maxdia * delta_shift + cable_mindia * delta_ellipse])
      circle(r= 0.5, $fn=30);

    square(center=true, [40, (cable_maxdia-cable_mindia) * delta_shift]);
  }
}

linear_extrude(height=20)
  CrossSection(0);

linear_extrude(height=1)
  CrossSection(2);